<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        ul a {
            color: #666666;
            text-decoration: none;
        }

        ul,
        li {
            display: block;
            position: absolute;
            left: 0;
            top: 0;
            margin: 0;
            list-style: none;
            background-color: white;
            border-bottom-right-radius: 100%;
            border-color: #dddddd;
            border-style: solid;
        }

        ul.ul1 {
            height: 100px;
            width: 100px;
            border-width: 0 2px 0 0;
            padding: 0;
        }

        ul.ul1>li {
            width: 200px;
            height: 200px;
            padding: 5px 10px 5px 0;
            border-width: 1px 2px 0 0;
            z-index: -1;
            text-align: right;
            transition: transform .3s linear, background-color .15s linear;
            transform-origin: 0 0;
            transform: translate(-100px, -100px);
        }

        ul.ul1:hover>li {
            transform: translateX(0px);
        }

        ul.ul1>li:hover {
            background-color: #eeeeee;
        }

        ul.ul1:hover>li:nth-child(2) {
            transform: rotate(15deg);
        }

        ul.ul1:hover>li:nth-child(3) {
            transform: rotate(30deg);
        }

        ul.ul1:hover>li:nth-child(4) {
            transform: rotate(45deg);
        }

        ul.ul1:hover>li:nth-child(5) {
            transform: rotate(60deg);
        }

        ul.ul1:hover>li:nth-child(6) {
            transform: rotate(75deg);
        }
    </style>
</head>

<body>
<ul class="ul1">
    导航
    <li class="li1"><a href="#">一级导航</a></li>
    <li class="li1"><a href="#">一级导航</a></li>
    <li class="li1"><a href="#">一级导航</a></li>
    <li class="li1"><a href="#">一级导航</a></li>
    <li class="li1"><a href="#">一级导航</a></li>
    <li class="li1"><a href="#">一级导航</a></li>
</ul>
</body>

</html>